pure as the driven snow

pure as the driven snow idiom
Morally unsullied, chaste, as in She's just sixteen and pure as the driven snow. This simile dates from the late 1500s, although driven, which means “carried by the wind into drifts,” was occasionally omitted. It is heard less often today.

The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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